Abrasion and grinding machine for saws



March 21, 1950 M. COLLIS 2,501,493

ABRASION AND GRINDING MACHINE FOR SAWS Filed ca. 29, 1948 s Sheets-Sheet1 6 Melvin Collis .& 6 9w ABRASION AND GRINDING MACHINE FOR SAWS FiledOct. 29, 1948 3 Sheets-Sheet 2 Zhwemlw 6 Welvz'n Collis March 21, 1950M, co s 2,501,498

ABRASION AND GRINDING MACHINE FUR SAWS Filed Oct. 29, 1948 3Sheets-Sheet 5 Patented Mar. 21, 1950 2,501,493 ABRASION ANDGRINDINGIMACHINE FOR SAW ' Melvin Collis, Chico, Calif., assignor ofseventyfive per cent to Ccyle E. Bybee and twenty-five per cent toGeorge Jeffery and Justin Jeffery,

all of Chico, Calif.

Application October 29, 1948, Serial No. 57,267 4 Claims. (01. 76-40)This invention relates to an abrasion and grinding machine for saws.

The primary object of this invention resides in the provision of anabrasion and grinding machine adapted to sharpen the teeth of all typesof saws.

Another object of this invention resides in the provision of an abrasionand grinding machine adapted to removably support all types of saws,cutting blades and the like for proper engagement thereof by thegrinding disc thereof.

A further object of this invention resides in the combination of theabrasion and grinding machine and attachments for supporting varioustypes of saws, cuttingblades and the like for contact by the rotatinggrinding disc thereof.

A still further object of this invention resides in the particularconstruction of the abrasion and grinding machine and the attachmentstherefor.

Aside from the foregoing objects, this invention resides in theparticular construction of the bed-plate of the abrasion and grindingmachine.

Among the many objects of this invention is the particular constructionand arrangement of the attachments relative to the grinding disc.

One of the salient features of this invention resides in the provisionof means whereby those elements to be operated on by the grinding disccan be adjusted relative thereto so as to grind the same in accordancewith predetermined specifications.

With these and other objects in view, this invention resides in certainnovel features of construction and arrangement of elements to be hereinmore fully set forth in the specification, illustrated in theaccompanying drawings and pointed out in the appended claims and,although this disclosure depicts my present conception of the invention,the right is reserved to resort to such departures therefrom as comewithin the scope of the claims.

In the accompanying drawings forming a part of this application;

Fig. 1 is a side view of the abrasion and grinding machine showing adisc saw secured thereto.

Fig. 2 is a plan view thereof.

Fig. 3 is a front view of the machine.

Fig. 4 is a longitudinal sectional view taken approximately on line 44of Fig. 2.

Fig. 5 is a perspective view of the base of the machine.

Fig. 6 is a perspective vie of the bed-plate.

Fig. 7 is a similar view of the adjustable standam.

Fig. 8 is a perspective view of the disc-saw supporting bracket.

Fig. 9 is a detail side view of the machine showing a modified form ofstop for the bed-plate.

Fig. 10 is a perspective view of the attachment for retaining a chainsaw in opposed position to the grinding disc.

In the present illustration of this invention, the numeral 5 designates,in general, an abrasion and grinding machine consisting of an elongatedbase 6 having laterally spaced standards I provided with verticallyspaced bearing apertures 8 adjacent their upper ends and rigidly securedtogether by laterally extending braces 9.

Pivotally journalled in an elected aperture 8 of the standards, as by alaterally extending pivot I0 is an elongated bed-plate II having aportion of its front end I2 cut out, as indicated by the numeral I3 withthe remaining portion of said front end provided with a rigid upstandinglug I4 having a head I 5 adjustably secured against its outer surface bya pivotal bolt I6 which, through the instrumentality of a thumbscrew I'Ithereon, secures said head in predetermined adjusted positions relativeto the lug I4 so as to retain a disc grinder I8, splined to a laterallyextending shaft I9 journalled on the outer surface of said head inbearings 20 atpredetermined angles relative to the element to beoperated on. Said disc grinder is disposed in the aforesaid cut outportion of the bed-plate and has a suitable guard 2| disposed thereover.

Secured to the bed-plate is an electric motor 22 having a pulley 23splined to its shaft and connected to a pulley 24 splined on the shaft I9 to transmit power to the disc grinder.

Secured to the aforesaid lug I4 is a forwardly I and upwardly extendinghandle 25 by which the bed-plate is rocked downwardly on its pivots I0against the tension of retractile coil springs 26 to engage the discgrinder against work being operated on and upon relaxing downwardpressure on the handle, said coil springs elevate the disc grinder fordisengagement with the work thereunder a distance governed by astop-chain 21 connected at one end to the front end of the bed-platewith its opposite end adjustably secured to a hook 28 secured to one ofthe standards.

'Pivoted on the base forwardly of the standards and beneath thebed-plate, as by a Vertical bolt 29 having a thumb-screw 3U thereon, isan elongated table 3| having a substantially semi-circular inner end 32and rigidly supporting a standard 33 at its outer end which is providedwith a plurality of vertically aligned apertures 34 through whichextends a bolt 35 having its outer end extending through an electedaperture 36 in a disc-saw supporting bracket 31 adjustably secured tosaid standard 33 by a nut 38, screw or bolt.

The aforesaid bracket 37 is of elongated configuration having asubstantially circular head 39 provided with an elongated bolt 4!! whichextends through a centrally disposed aperture 4| in a disc-saw 42 andslidably supports a cone shaped plug 43 having its smaller end forced insaid aperture 4! by a nut 44 screwed on the outer threaded end of saidbolt against washers 45 or the like to rigidly secure the disc-saw 'tothe bracket. Said head 39 also carries a plurality of studs 45 adaptedto retain the disc-saw a suflicient distance from the same to permit thesmaller end of said plug to be forced well into the aperture of thedisc-saw.

In order to limit downward rocking movement of the bed-plate on itspivots, a stop rod 4? extends upwardly from said standard 33 in the pathof the forward end of the same and is adjustable to govern engagement ofthe disc grinder with the disc saw or other work being operated on.

Subsequent to securing the bracket with the, disc-saw thereon to thestandard 33, a set-screw 48 or other similar element carried at the,upper end of the standard is screwed against the inner surface of thedisc-saw to prevent chattering of the same when engaged by the discgrinder.

In the modified form of the machine as shown in Fig. 9, rocking movementof the bed-'plateis limited by crank-screws A threaded in opposite endsof an angle-iron beam B which is rigidly secured to the standardsorother portions of the base so the outer ends of said crank-screwsremain in opposed relation to opposite ends of said i bed-plate, thusproviding means to govern contact of the disc grinder with the work andalso dispose it at an'elected distance therefrom when in idling positionabove the work.

In Fig. 10 of the drawings the letter C designates an attachment forsupporting a chain-saw in opposed position to the aforesaid disc grinderand consists of an arcuate channel shapedguide D having arms Econnected'to the circular head of the bracket 3'1 by bolts F or thelike. guide has rollers G disposed therein to support the chain saw withits teeth presented toward the disc. grinder and, in order to secure thechain-saw against accidental sliding movement within the channel of theguide, spring controlled stops H are disposed adjacent opposite ends ofthe guide for engagement with the adjacent teeth of the chain-saw and,when the operator of the machine has finished grinding those teethbeneath the disc grinder, he either manually lifts the stops fromengagement with those teeth engaged thereby or slides the chain-sawalong to automatically lift the same to dispose other teeth beneath thedisc grinder. Said bracket with the guide thereon is attached to thestandard of the table in a manner'heretofore set forth.

With this invention fully set forth, it is manifest that an abrasion andgrinding machine of simple construction is provided and through theinstrumentality of the adjuncts thereto, all types of saws and cuttingblades can be sharpened .and restored to their originalcondition.

Having thus described my invention, what I claim and desire to protect'by Letters Patent is:

Said p 'rockable bed-plate, an upstanding lug rigidly secured to theforward end of the bed-plate, braces connecting the standards above thebase, a head disposed against the outer surface of said lug, a boltextending through the head and lug, a thumb-nut screwed on the bolt andbearing against the lug, laterally aligned bearings secured to the outersurface of the head, a shaft journalled in said bearings, a disc grindersecured to one end of the shaft and disposed in the cut out area of thebed-plate, an electric motor secured to the bed-plate, pulleys splinedto the shafts of the motor and disc grinder, a belt trained over saidpulleys, a guard secured to the forward cutout portion of thebed-plate-and extending over the disc grinder, a handle secured to saiding and extending forwardly of the bedplate, retractile coil springsconnecting the rear end of the bed-plate to the standards, a chainadjustably connecting the forward end of the bed-plate to the standards,a table disposed on the forward portion of the base, a pivotal boltextending vertically through the base and table, a thumb-nut screwed onthe upper end of said bolt and bearing against the table to secure it inelected positions around the bolt, a standard rigidly secured to theforward end of the table and having a plurality of vertically alignedapertures therethrough, an elongated bracket disposed against the outersurface of the standard and having a plurality of apertures through itsouter end and enlarged substantially circular inner end, a boltconnecting the bracket to the standard in adjustedpositions relativethereto, an elongatedbolthaving its outer threaded end secured to thecircular inner end of the bracket, studs secured to the circular innerend of the bracket, with their outer ends bearing against the innersurfaces of a disc saw mounted on said elongated bolt, a conical plugslidably mounted on the outer portion-of said elongated bolt with itssmaller end extending into a centrally disposed aperture in the discsaw, a washer-disposed on the outer portion of the elongated bolt, a nutsecured on the outer end of the elongated bolt and tightened againstsaid washer toforce the conical plug into the aperture of the disc sawand secure it to the bracket; a stop secured to the upper end of thetable standard'in the path of the forward end of the bed-plate,,andaset-screw threaded through said table standard adjacent its upper endwith its outer end bearing against the inner'surface of the discsaw'toprevent chattering thereof when operated on by the disc grinder.

2. In an abrasion and grinding machine comprising .a base, standardsrigidly secured to the base, a rockable bed-plate pivoted to thestandards, a table adjustably mounted on the forward end .of the base, astandard rigidly secured to the table, a bed-plate rockably secured tothe standards of the base, a power driven discgrinder adjust-ablysecured to the front end of said bedplate, a bracket adjustably securedto the standard of. the table, saw supporting means carried by saidbracket, retractile coil springs connecting the rear end of thebed-plate to the standards of the base, an elongated beam secured to oneof the standards beneath the bed-plate, a handle secured to the forwardend of the bed-plate, and crank-screws threaded in opposite ends of saidbeam with their upper ends disposed in the path of opposite ends of thebed-plate to limit its rocking movement toward and from a saw mounted onthe bracket.

3. An abrasion and grinding machine comprising, a base, spaced standardsrigidly secured to the base, an elongated bed-plate rockably securedbetween the standards, a lug rigidly secured to the forward end of thebed-plate, a head pivotally and adjustably secured to said lug, a shaftjournalled on said head, a disc grinder secured to one end of the shaft,an electric motor secured to the bed-plate forwardly of its pivotedconnections to the standards, power transmitting means connecting themotor to the aforesaid shaft, crossed retractile coil springs connectingopposite sides of the rear end of the bed-plate to opposite standards,stop means on a standard limiting upward rocking movement of the forwardend of the bed-plate by the coil springs, a table pivotally and slidablyrested on the forward portion of the base, means securing said table inadjusted positions on the base, a standard rigidly secured to the tableadjacent the forward end of the bed-plate, cutting element supportingmeans adjustably secured to the standard of the aforesaid table andretaining a cutting element thereon in the path of the grinder forsharpening the same, and a handle on the bed-plate.

4, An abrasion and grinding machine, the combination of, a base, abed-plate rockably mounted on the base and biased in one direction bycrossed coil springs; a shaft pivotally supported on the forward end ofthe bed-plate, a grinding wheel secured to the shaft, an electric motorsecured to the bed-plate, power transmitting means connecting the motorto the grinding wheel shaft, a standard pivotally and slidably mountedon the forward portion of the base beneath the forward end of thebed-plate, means securing the standard to the base in elected positionsthereon, cutting element supporting means adjustably secured to thestandard for disposing a cutting element carried thereby in the path ofthe grinding wheel, and stop means supported by the base limiting bothupward and downward rocking movement of the bed-plate.

MELVIN COLLIS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 89,724 Abbott et al May 4, 18691,145,746 Brown July 6, 1915 2,148,369 Eastwood Feb. 21, 1939 2,200,883Harten May 14, 1940 2,217,145 Stihl Oct. 8, 1940 2,217,545 Guenther Oct.8, 1940 2,318,456 Blum May 4, 1943 2,459,233 Mall Jan. 18, 1949

